From 777a25293e6b4ae0ecec94cae58b60a347f1911a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9C=D0=B8=D1=85=D0=B0=D0=B9=D0=BB=D0=BE=D0=B2=20=D0=90?=
 =?UTF-8?q?=D0=BD=D1=82=D0=BE=D0=BD?= <anion155@gmail.com>
Date: Thu, 15 Nov 2018 21:29:38 +0500
Subject: [PATCH] Object.assign return assigned type instead merged

---
 src/lib/es2015.core.d.ts | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/lib/es2015.core.d.ts b/src/lib/es2015.core.d.ts
index cfb300c784d74..1db580accbe30 100644
--- a/src/lib/es2015.core.d.ts
+++ b/src/lib/es2015.core.d.ts
@@ -256,6 +256,11 @@ interface NumberConstructor {
     parseInt(string: string, radix?: number): number;
 }
 
+/**
+ * Assign properties from U to T.
+ */
+type Assign<T, U> = Pick<T, Exclude<keyof T, keyof U>> & U
+
 interface ObjectConstructor {
     /**
      * Copy the values of all of the enumerable own properties from one or more source objects to a
@@ -263,7 +268,7 @@ interface ObjectConstructor {
      * @param target The target object to copy to.
      * @param source The source object from which to copy properties.
      */
-    assign<T, U>(target: T, source: U): T & U;
+    assign<T, U>(target: T, source: U): Assign<T, U>;
 
     /**
      * Copy the values of all of the enumerable own properties from one or more source objects to a
@@ -272,7 +277,7 @@ interface ObjectConstructor {
      * @param source1 The first source object from which to copy properties.
      * @param source2 The second source object from which to copy properties.
      */
-    assign<T, U, V>(target: T, source1: U, source2: V): T & U & V;
+    assign<T, U, V>(target: T, source1: U, source2: V): Assign<Assign<T, U>, V>;
 
     /**
      * Copy the values of all of the enumerable own properties from one or more source objects to a
@@ -282,7 +287,7 @@ interface ObjectConstructor {
      * @param source2 The second source object from which to copy properties.
      * @param source3 The third source object from which to copy properties.
      */
-    assign<T, U, V, W>(target: T, source1: U, source2: V, source3: W): T & U & V & W;
+    assign<T, U, V, W>(target: T, source1: U, source2: V, source3: W): Assign<Assign<Assign<T, U>, V>, W>;
 
     /**
      * Copy the values of all of the enumerable own properties from one or more source objects to a